package com.atguigu.principle.ocp;


/**
 * @author gcq
 * @Create 2020-09-28
 */
public class Ocp {

    public static void main(String[] args) {
        // 使用看看存在的问题
        GraphicEditor graphicEditor = new GraphicEditor();
        graphicEditor.drawShape(new Rectangle());
        graphicEditor.drawShape(new Circle());
        graphicEditor.drawShape(new Triangle());
        graphicEditor.drawShape(new A());
    }
}
// 这是一个用于绘图的类
class GraphicEditor {
    public void drawShape(Shape s) {
        if (s.m_type == 1) {
            drawRectangle(s);
        } else  if (s.m_type == 2) {
            drawCircle(s);
        } else if (s.m_type == 3) {
            drawTriangle(s);
        } else if (s.m_type == 4) {

        }
    }
    public void drawRectangle(Shape r) {
        System.out.println("绘制矩形");
    }
    public void drawCircle(Shape r) {
        System.out.println("绘制圆形");
    }
    public void drawTriangle(Shape r) {
        System.out.println("绘制三角形");
    }
    public void drawA(Shape r) {
        System.out.println("绘制A");
    }
}
// Shape类 基类
class Shape {
    int m_type;
}
class Rectangle extends Shape {
    Rectangle() {
        super.m_type = 1;
    }
}
class Circle extends Shape {
    Circle() {
        super.m_type = 2;
    }
}
//新增画三角形
class Triangle extends Shape {
    Triangle() {
        super.m_type = 3;
    }
}
class A extends Shape {
    A() {
        super.m_type = 4;
    }
}